78220412 has 12 divisors (see below), whose sum is σ = 138297600. Its totient is φ = 38706816.

The previous prime is 78220379. The next prime is 78220433. The reversal of 78220412 is 21402287.

It is a super-2 number, since 2×78220412² = 12236865706899488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100412 + ... + 101187.

It is an arithmetic number, because the mean of its divisors is an integer number (11524800).

Almost surely, 2^78220412 is an apocalyptic number.

It is an amenable number.

78220412 is a deficient number, since it is larger than the sum of its proper divisors (60077188).

78220412 is a wasteful number, since it uses less digits than its factorization.

78220412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201700 (or 201698 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 78220412 is about 8844.2304357134. The cubic root of 78220412 is about 427.6679449115.

Adding to 78220412 its reverse (21402287), we get a palindrome (99622699).

The spelling of 78220412 in words is "seventy-eight million, two hundred twenty thousand, four hundred twelve".